Abstract: An angle adjustable lamp includes a base, at least one lamp holder, a support rod installed between the base and the lamp holder, and an angle adjusting mechanism disposed between the support rod and the lamp holder. The angle adjusting mechanism includes a plurality of cavities circularly arranged at one end of the support rod, at least one protrusion formed on the lamp holder and a bolt. The shape and location of the protrusion is corresponding to the cavities. The bolt pivots the support rod and the lamp holder, so the protrusion can be engaged with various cavities. When the lamp holder is turned, the location of the protrusion is changed so as to be engaged with another cavity, such that the illumination angle of the lamp is adjusted. The adjusted angle is fixed through tightening the bolt.